Chuck Rainey was on a film score session, and couldn't read ledger lines very well. There was a very busy couple of bars with a lot of ledger lines. He fluffed the first take and Tommy Tedesco stood up and apologised. Chuck fluffed the second take as well. Tommy stood up again. This time, when he sat down, he whispered to Chuck, "Next time you're on your own, kid!". On take 3 Chuck didn't play those bars. To his amazement, everyone on the session was playing the riff and no one in the control room noticed that he'd stopped playing.